PHP code to get CPU usage

In PHP, you can use getrusage() to get the CPU usage. This method is only applicable to Linux systems. Example:

<?php
//获取cpu使用情况
print_r(getrusage());  
/* 输出 
Array 
( 
[ru_oublock] => 0 
[ru_inblock] => 0 
[ru_msgsnd] => 2 
[ru_msgrcv] => 3 
[ru_maxrss] => 12692 
[ru_ixrss] => 764 
[ru_idrss] => 3864 
[ru_minflt] => 94 
[ru_majflt] => 0 
[ru_nsignals] => 1 
[ru_nvcsw] => 67 
[ru_nivcsw] => 4 
[ru_nswap] => 0 
[ru_utime.tv_usec] => 0 
[ru_utime.tv_sec] => 0 
[ru_stime.tv_usec] => 6269 
[ru_stime.tv_sec] => 0 
) 
*/

Explanation: ru_oublock: block output operation ru_inblock: block input operation ru_msgsnd: message sent ru_msgrcv: message received ru_maxrss: Maximum resident set size ru_ixrss: total shared memory size ru_idrss: All non-shared memory size ru_minflt: page recycling ru_majflt: page invalid ru_nsignals: received signals ru_nvcsw: active context switch ru_nivcsw: Passive context switch ru_nswap: swap area ru_utime.tv_usec: User mode time (microseconds) ru_utime.tv_sec: User mode time (seconds) ru_stime.tv_usec: System kernel time (microseconds) ru_stime.tv_sec: System kernel time? (seconds) Sometimes you need to check how much CPU a script consumes, and you need to look at the values ​​of "user mode time" and "system kernel time". The seconds and microseconds parts are provided separately. You can divide the microsecond value by 1 million and add it to the seconds value to get the number of seconds with a decimal part. Example:

<?php
// sleep for 3 seconds (non-busy)  
sleep(3);  
$data = getrusage();  
echo “User time: “.  
($data['ru_utime.tv_sec'] +  
$data['ru_utime.tv_usec'] / 1000000);  
echo “System time: “.  
($data['ru_stime.tv_sec'] +  
$data['ru_stime.tv_usec'] / 1000000);  
/* 输出 
User time: 0.011552 
System time: 0 
*/

sleep does not occupy system time, example:

<?php
// loop 10 million times (busy)  
for($i=0;$i<10000000;$i++) {  
}  
$data = getrusage();  
echo “User time: “.  
($data['ru_utime.tv_sec'] +  
$data['ru_utime.tv_usec'] / 1000000);  
echo “System time: “.  
($data['ru_stime.tv_sec'] +  
$data['ru_stime.tv_usec'] / 1000000);  
/* 输出 
User time: 1.424592 
System time: 0.004204 
*/

The execution of the above code consumes approximately 14 seconds of CPU time, almost all of which is user time because there are no system calls. System time is the time the CPU spends executing kernel instructions on system calls. Example:

<?php
$start = microtime(true);  
// keep calling microtime for about 3 seconds  
while(microtime(true) – $start < 3) {  
}  
$data = getrusage();  
echo “User time: “.  
($data['ru_utime.tv_sec'] +  
$data['ru_utime.tv_usec'] / 1000000);  
echo “System time: “.  
($data['ru_stime.tv_sec'] +  
$data['ru_stime.tv_usec'] / 1000000);  
/* prints 
User time: 1.088171 
System time: 1.675315 
*/

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